Don't Miss

Shang's mother said: "He cannot go above a first floor or near tall buildings. He wakes up most nights, yelling 'earthquake!'"

Nearly 7,000 schoolrooms were destroyed by powerful earthquake, which killed nearly 70,000 people, according to the latest government figures. More than 18,000 people are still listed as missing three weeks after the quake.

Many parents who lost their children have complained about what they say is shoddy construction of the schools.

In the town of Wufu in Sichuan province, nearly every building remains standing, except for the primary school, where at least 200 children died. Some parents have threatened to sue the government; others have demanded a thorough investigation.

The children who walked away from those collapsed schoolhouses -- like Shang -- need help coping with their memories, but the system is overwhelmed, his mother said.

"There are so many children with nothing now, no parents," she said. "They really need good doctors. No one counted on so many of the other children, like mine, needing good help too."